Grooved pulley



March 7; 1933. R, H. BOWEN GROOVED PULLEY Filed Nov. 10, 1930 INVENTOR.JfZuSeZLHDmJ/en,

BY I ATTORNEY/S.

Q W .TNEisggij. M

Patented Mar. 7, 1933 UNITED. STATES PATENT OFFICE:

RUSSELL H. BOWEN, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOB TO,THE'AMEBICAN IU'LLEY GOIMIANY, OF PHILADEIIPEIA, PENNSYLVANIA, ACORPORATION OF PENN- GBOO'VED PULLEY Application filed November 10,1930. Serial No. 494,689.

My invention relates to the construction of a grooved pulley, such asmay be built up by the juxtaposition upon a hub of annular stamped metaldisks secured thereto, each disk including an inclined portion whichfornis one wall of a groove. The inner edges of these annular disks aresecured to the hub inany suitable manner and the grooyes of the pulleyare created by the juxtaposition of alternately reversed annular paireddisks.

In such a pulley large enclosed air spaces are created between the wallswhich form the grooves. My invention has for its end to provide-foracirculation of air within these spaces in order to reduce thetemperature of the pulley when in use, it having been found thatfriction between such pulleys andtheir driving belt may sometimes heatthe pulley to a sufiiciently high temperature tobe injurious to thebelt.

with capacity for splining upon a main shaft.

The perimeter of the pulley is built up by the paired juxtaposition uponthe shaft of annular disks 3. Each disk 3 comprises an outer inclinedsurface4reaching to the perimeter of said disk and forming a wall of agroove, and each disk 3 is formed with a somewhat tubulate flange 8 onits inner edge. The portion of each disk 3 which connects the flange 8with the inclined surface 4 may includea web 7.

By placing two of these annular disks 3 upon the hub 1 in alternatelyreversed position, a grooved pulley is created and by increasing thenumber of said disks similarly placed a multi-grooved perimeter is builtup, each adjoining pair of inclined surfaces 4 forming a single groove.

Two adjacent disks may be secured to the hub by a single collar 10having such dimensions that the flanges 8 of two of the disks 3 areclamped between it and the hub I, one disk 3 passing around one edge andthe other around the other edge of the collar 10. The

' parts are shaped to make this a driving fit so that the compression ofthe collar 10 firmly secures the disks 3 in place against both lateralstrain and torque.

At each end of the series of annular disks 3. thus described I mayplacedisks 5 differing in shape from the others but also formed with ,upagainst each other with production of the multi-grooved pulley which Ihave shown, in which the use of the stamped disks 3 lightens the pulleysand also provides an economical construction.

Such a pulley possesses large air spaces 11 between the walls of eachpair of disks 3, and

it is the design of my present invention to provide for the ventilationof these air spaces r inorder to lessen the possible heating of thepulley when in use due to friction between the belts which drive thepulley. and the walls 4 of the grooves in which these belts are receiyed. To this end I perforate the disks 3 with small apertures atdifferent points. Thus in each disk I may provide a series of an-'nularly arranged perforations or apertures 12 near the base of theinclined surface where it joins the web 7 of the disk 3. If two of theseapertures on" adjoining disks 3 to be caused to register, as shown onthe drawing, the capacity of said apertures to admit air will be thegreater. I also provide a series of apertures 13 at or near theperipheries of the disks 3. As shown each of two disks 3 has its edgerecessed, and two of these recesses on r l the air near the the rotationof the pulley, forced into. the

f f A llfitdlwfi I 1 v Y near its epeini, e, the perimeter of the disks8. peripheral edge, whereby a continuous circu l n use, as the drivingbelt wraps itself lation of fresh air can be maintained through, aroundthe pulle in "its appropriate groove, each air spaceassisted bycentrifugal-force ottom .ot' the groove is, by created during rotationof the pulley,

5. A multi-grooved pulley com rising a first describedapertures 13leading to the air hub, with annular discs juxtapose in almr space llbetween the grooveasand the air nately reversed position thereon toprovide which is thus forced intovsaid space 'continuair spaces betweenthe walls of the grooves,

ully escapes from the other apertures 13 at or each said disc embodyingan outer inclined near the perimeter-oi the pulley being assistsaidpulley.

v space during rotation of the pulley.

groove wall and an inner hub-contacting trued in this by the centrifugalforce created by b rotation of the pulley. lln this way acircucumfcrentially spaced perforations connectlation of air ismaintained and the tempera.- ing into, each air space at the bottom ofthe ture of the pulley maintained more nearly grooveand in theperipheral edge thereol to that of the surrounding atmosphere, thuseilect continuous circulation of fresh air ular flange, said; groovewalls having cirovercoming a difi iculiy frequently euperithrough therespective air spaces duringrotaenced, namely, that frictionloetween thedrivtion of the pulley, and each said er'foration -ing belts and thepulley gradually raises the being formed by opposed recessions in thetemperature of the pulley to a point which is outer edges and at adjoining inner portions of deleterious to the pulley and to the belt whichthe inclined groove walls when two of the drives it. discs arejuxtapositioned'as aforesaid.

Having thus described my (invention, It 6.1x multi-grooved pulleycomprising a Y claim: hub with annular discs juxtaposed in alter l. Arnulti-grooved pulley provided with nately reversed position thereon toprovide air spaces between the walls cl the grooves, air spaces betweenthe walls of the grooves, and said walls having apertures connectingeach said disc embodying an outer inclined with each air space bothinthe region of the groove wall and an inner hub-contactinlgtubottomelf/the groove and in the region of the bular flange with anintervening; straight perimeter of the pulley, whereby a continu webportion, said groove walls having cir-" ous circulation of fresh airthrough the recumicrentially spdced perforations connectspective spacesis efiected' assisted by the cening into each air spaoe' at the bottomof the trifugal force created incident to rotation ot groove and in theperipheral edge thereof to 2. In a multi-grooved belt pulleycompristhrough the respective air s aces during roing ahub'with'similanannular discs juxtatation of the pulley, each saiperforation beposed in almrnately reversed position thereing formed byoppo'se'gecessions in the outer on to form air spaces between the wallsof edges and at inner portions or" the inclined the grooves, and saidwalls having circunrgroove walls adjoining the straightweb perferentially spaced perforations therein some tions when two of the discsare juxtaposiof which are located within and some without tioned asaforesaid, and the perforations at the region-of belt contact to efl'ectcontinuous the bottoms of the respective grooves being of circulation offresh air through each air greater air admitting capacity than thoge attheperipheral edges of said r'ooves. 3. A multi-grooved pulleycomprising a In testimony whereof, l have hereunto hub with annulardiscs juxtaposed in altersigned my name at Philadelphia, Pennsylnatelyreversed positionthereon to form air Vania, this 6th day of November1930.

spaces between the walls of the grooves, each each RUSSELL H. BOWEN. 7said disc embodying an outer inclined groove Q wall and an innerhub-contacting flange, and

oove wall having circumfcrentially space perforations therein atdiderent radial locations to efiect continuous circulation of fresh airthrgfigh eachair space during rotation of the p 55.

4. A multi-grooved pulley coniprising a hub with annular discsjuxtaposed alter-J nately reversed position'thereon to torm air spacesbetween the walls of the grooves, each said disc embodying an outerinclined groove wall and an inner hub-contacting tubular flange with anintervening straight web porti'on, and saidcgroove walls havingcircumferentially spaced perforations connecting into each air spaceboth in the region of the bottom fthe groove and in the region of itsefiect continuous circulation of fresh air ,7

